What is Atex Zone 2 Explosion Proof ?

A Hazardous area is defined as a three-dimensional space where a flammable

atmosphere maybe expected to be present at such frequencies as to require special

precaution for the type and use of electrical apparatus or other potential ignition

sources. Hazardous area will be identified and classified into zone 0, zone 1, and

zone 2.

Identifying Zone 0, Zone 1, and Zone 2 Hazardous Areas

Fundamentally, for an explosion to take place, flammable or explosive gases, vapours, mists or dusts will be present. Then, the level of risk of an explosion is based on the frequency 

and duration of the occurrence of an explosive atmosphere. This level of risk is represented by classifying the hazardous area as Zone 0, Zone 1 or Zone 2 (for gas, vapour and mist 

atmospheres) or Zone 21 or Zone 22 for dust atmospheres.

ZONE 0    

Explosive atmosphere is Continuouslypresent

Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur.

ZONE 1

Explosive atmosphere is Often present

Zone 1 is an area in which an explosive atmosphere is likely to occur occasionally in normal operation. It may exist because of repair, maintenance operations, or leakage.

ZONE 2

Explosive atmosphere may Accidently be present

Zone 2 is a place in which an explosive atmosphere is not likely to occur in normal operation but, if it does occur, will persist for a short period only. These areas only become 

hazardous in case of an accident or some unusual operating condition.